Altos ACS 8000-7 (8200) mainboard wanted / Shugart 4008 motor pulley

Jay Jaeger cube1 at
Sat Jul 11 10:32:44 CDT 2015

I use emulators as well, and have written some, but I also enjoy working
with the real hardware.

The Altos ACS-8000 series are all Z80's .


On 7/10/2015 10:05 PM, wulfman wrote:
> On 7/10/2015 7:50 PM, Jay Jaeger wrote:
>> Long story, but....
>> I recently acquired an Altos ACS 8000-2 with an 8100-01 mainboard (which
>> currently is not functioning).   Acquired it on eBay where it was
>> represented as an ACS-8000-7, along with an Altos 8000-7A 29MB hard disk
>> (a Shugart 4008).  The hard disk was fine, but the computer wasn't the
>> one shown in the photo.  (I arranged for a partial refund.  At least the
>> disk was the one in the photo.  ;) ).
>> I was wondering if anyone had an 8200 mainboard (the one with the logic
>> for the hard disk on it) that they would be willing to sell at an
>> affordable price?
>> Also, I have a second Shugart 4008 hard disk, but it was configured for
>> 50Hz - so the motor pulley is the wrong size.  Anyone out there have a
>> dead 4008 that they would be willing to have part with its motor pulley
>> and belt (and get the 50Hz set in return)?  (For example, I saw a
>> posting on youtube with a wobbly platter set that probably is a good
>> candidate...  ;) ).
>> Any tips on troubleshooting the mainboard on a double density Altos 8000
>> computer (mainboard 8100) would also be appreciated.  I have already
>> reseated the chips, polished the tarnish off some chips the apparently
>> had silver-plated pins, etc., to no avail.  Have dumped the ROM (2708).
>>  Next plan is to disassemble that, and slap a logic analyzer on "J2"
>> which has all of the bus signals on it.
>> Thanks in advance...
>> JRJ
> This is why i collect cpu emulators. I have almost every kind made. I do
> however need some jumper headers for a 68000 HMI unit
> thats set for 68008 mode but thats another story.
> what main CPU does this use, 8080 or a Z80 or ???

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